/**
 * #      594
 * 名称   最长和谐子序列
 * 链接   https://leetcode-cn.com/problems/longest-harmonious-subsequence
 * 题解   [196](https://leetcode-cn.com/problems/longest-harmonious-subsequence/solution)
 * 通过率 50.5%
 * 难道   简单
 */

